Pick to solve the system of equations using the (elimination, substitution) method, i would (multiply equation 1 by -1 and add the equations together, multiply equation 2 by -3 and add the equation together, replace x in equation 1 with -x+15, replace y in equation 1 with -x+15, or multiply equation 2 by -1 and add the equations together) in order to solve for y.

Ricardo ran the 400 meter race 3 times his fastest time was 54.3 seconds his slowest time was 56.1 seconds if his average time was 55.0 seconds what was his time for the third race

Me. i can't figure out this question. give an explanation too. .

Question 3 (essay worth 10 points) (03.06 mc) part a: max rented a motorbike at $465 for 5 days. if he rents the same motorbike for a week, he has to pay a total rent of $625. write an equation in the standard form to represent the total rent (y) that max has to pay for renting the motorbike for x days. (4 points) part b: write the equation obtained in part a using function notation. (2 points) part c: describe the steps to graph the equation obtained above on the coordinate axes. mention the labels on the axes and the intervals. (4 points)